X is an ionic compound containing only magnesium, aluminium and oxygen. Which of the following can be the chemical formula for X?

Mg₂AlO₄

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MgAl₂O₄

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MgAlO₄

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Mg₄AlO₂

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Solution

The correct option is B
MgAl₂O₄

Net charge of an ionic compound is zero. Mg has a charge of +2, Al has +3 and O has -2. Therefore, in $M g {A l}_{2} O_{4}$ the net charge is 0 as (+2)(1) + 2(3) + 4(-2) = 0.

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